adjective
superlative form of 1bad
worse than all others
least skillful, talented, or successful
least appropriate, useful, or helpful
in the worst way
US informal :very much
worst of all
used to refer to the least pleasant or appealing part of something that has many bad parts
your own worst enemy
adverb
superlative form of badly
in the worst way :in a way that is worse than all others
noun
the worst :the worst person or thing
[singular] :someone's or something's least effective or pleasant condition :someone's or something's worst condition - used in phrases like at your worst and at its worst
at worst
used to refer to a result, condition, etc., that is the worst one possible
bring out the worst in
If someone or something brings out the worst in you, that person or thing causes you to use or show your worst qualities.
get the worst of it
to lose a fight, argument, battle, etc.
if (the) worst comes to (the) worst
or if (the) worse comes to (the) worst also if worse comes to worse
if the worst possible thing happens